The Ministry of Food, Agriculture and Livestock published the Turkish Food Codex Communiqué on Methods of Analysis of Purity Criteria of Food Additives (Communiqué no: 2001 / 46), based on the Turkish Food Codex Regulation. This communiqué, which specifies the analysis methods that determine whether the additives used in foodstuffs meet the purity criteria, covers the purity criteria analysis methods of preservatives, colorants and antioxidants.

It is essential that laboratories work within the framework of relevant legal regulations, published standards and methods that have been scientifically proven. This is a necessity in terms of relations with the European Union.

In the Annex of the Communiqué titled General Principles (Annex 1), preparation of the sample for analysis, reagents, devices and materials; and disclosure of results. For example, the sample taken should be homogenized prior to analysis. The prepared sample should be stored in an airless and moisture-free container to prevent deterioration. All reagents used must be of analytical purity. Unless otherwise specified, the results of the analysis shall be given as a percentage by mass of the original sample coming to the laboratory.

In the article 4 of the Communiqué entitled Analysis Methods and its annexes, fifteen methods covered by the communiqué are explained. Some of these methods are based on coratographic method and some are based on titremetric method.

Titrimetric methods are based on measuring the amount of any solution of known concentration with the analyte. Application of titrimetric methods is very wide and effective quantitative analysis methods. There are different applications in itself. For example, in the volumetric method, the volume of a solution of known concentration is measured. In gravimetric method, the mass of the reagent is measured instead of volume. In the coulometric method, the time taken to complete the electrochemical reaction is measured.

In the laboratories, various purity analyzes are carried out by titrimetric methods for food additives. In these test studies, the principles mentioned above and the standards published in our country and in foreign countries are complied with.